Abstract

본 논문에서는 수 MeV 이상의 에너지를 갖는 전자들(electrons)의 비정상적인 증가 현상 즉 Relativistic Electron Events(REE)와 자기 폭풍(magnetic storm) 및 자기 부폭풍(magnetic substorm) 사이의 상관 관계에 대해 연구하였다. 이를 위해 먼저 1996-1998년의 3년 동안 일어났던 자기 폭풍을 조사하여 REE를 동반하는 자기 폭풍과 동반하지 않는 자기 폭풍의 두 그룹으로 분류하여 분석하였고, 두 그룹 각각의 자기 폭풍이 일어나는 동안 발생한 자기 부폭풍들의 특성을 살펴보았다. 특히 수십에서 수백 keV 에너지대의 고에너지 입자 수 증가(energetic particle injection) 현상과 자기장 쌍극자화(magnetic dipolarization) 현상을 분석한 결과, REE를 동반하는 자기 폭풍 동안에 발생한 자기 부폭풍이, REE를 동반하지 않는 자기 폭풍이 일어나는 동안 발생한 자기 부폭풍보다 더 강하게 나타난다. This paper reports a statistical study on the relationship between relativistic electron events(REE), magnetic storms, and substorms. We have used magnetic storm events that occurred between 1996 and 1998, and have classified them into two groups, (i) magnetic storms with REE and (ii) magnetic storms without REE, according to whether or not the magnetic storm is accompanied by REE. Then we have examined the characteristics of substorms that occurred during the main phase of each of the magnetic storms, and compared them between the two groups of the storms. In particular, we have made some quantitative estimations on the intensities of the energetic particle injections and magnetic dipolarizations during the substorm. We find that the injection intensity ratio and the magnetic dipolaization of the storm-time substorms are bigger for substorms with REE than for those without REE.

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